CN115139614A - Modified polypropylene power conduit and preparation method thereof - Google Patents

Modified polypropylene power conduit and preparation method thereof Download PDF

Info

Publication number
CN115139614A
CN115139614A CN202210881151.7A CN202210881151A CN115139614A CN 115139614 A CN115139614 A CN 115139614A CN 202210881151 A CN202210881151 A CN 202210881151A CN 115139614 A CN115139614 A CN 115139614A
Authority
CN
China
Prior art keywords
layer
polypropylene
phase change
power conduit
raw materials
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202210881151.7A
Other languages
Chinese (zh)
Other versions
CN115139614B (en
Inventor
吴新华
姜渭龙
李斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Longcai Plastic Industry Co ltd
Original Assignee
Zhejiang Longcai Plastic Industry Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Longcai Plastic Industry Co ltd filed Critical Zhejiang Longcai Plastic Industry Co ltd
Priority to CN202210881151.7A priority Critical patent/CN115139614B/en
Publication of CN115139614A publication Critical patent/CN115139614A/en
Application granted granted Critical
Publication of CN115139614B publication Critical patent/CN115139614B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a general shape other than plane
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/02—Layer formed of wires, e.g. mesh
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B32B5/20—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material foamed in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/245—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it being a foam layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/32—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed at least two layers being foamed and next to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/102—Azo-compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/102—Azo-compounds
    • C08J9/103—Azodicarbonamide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
    • C08J9/105—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/107—Nitroso compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/36—After-treatment
    • C08J9/365—Coating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/14—Copolymers of propene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D191/00—Coating compositions based on oils, fats or waxes; Coating compositions based on derivatives thereof
    • C09D191/06—Waxes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
    • H02G3/0406—Details thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
    • H02G3/0462—Tubings, i.e. having a closed section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B32B2262/0269—Aromatic polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B32B2262/0284—Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0292—Polyurethane fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/103—Metal fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/025—Polyolefin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00—Tubular articles, e.g. hoses, pipes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/14—Copolymers of propene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2409/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/10—Homopolymers or copolymers of propene
    • C08J2423/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/24—Crystallisation aids
    • C08L2205/242—Beta spherulite nucleating agents

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • Inorganic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention provides a modified polypropylene power conduit and a preparation method thereof, wherein the power conduit comprises: the supporting layer is a modified polypropylene pipe; the functional layer is a multilayer tubular structure coated on the periphery of the supporting layer; the functional layer comprises a plurality of functional layers which are arranged from inside to outside in sequence: the outer layer is a tubular foaming body formed by compounding modified polypropylene and first reinforcing fibers; the middle layer is a tubular foaming body formed by compounding modified polypropylene and second reinforced fibers; the modified polypropylene power conduit and the preparation method thereof have the advantages of high strength, good toughness and good flame retardant property.

Description

Modified polypropylene power conduit and preparation method thereof
Technical Field
The invention relates to the technical field of power conduits, in particular to a modified polypropylene power conduit and a preparation method thereof.
Background
Polypropylene resin is one of four general-purpose thermoplastic resins, and is generally a colorless, odorless, nontoxic, translucent solid substance. Polypropylene, as a thermoplastic synthetic resin, has the advantages of good chemical resistance, heat resistance and electrical insulation, and simultaneously has high-strength mechanical properties, good high-wear-resistance processing properties and the like, so that polypropylene has been widely used in numerous fields such as machinery, automobiles, electronic appliances, buildings, textiles, packaging, agriculture, forestry, fishery, food industry and the like since the coming out, and is particularly used as a raw material for preparing electric power protection pipelines, and at present, polypropylene has become one of the most common electric power pipes in the market.
However, polypropylene has poor toughness, poor weather resistance, poor impact resistance at low temperature, low pressure resistance, and a large difference between the functionality in the aspects of electricity, magnetism, light, heat, combustion and the like and the actual demand, and the modification of polypropylene has become the most active field of the current plastic processing development and the most productive field.
At present, a chemical modification method for improving the mechanical properties, heat resistance, aging resistance and other properties of polypropylene polymer components by changing the macromolecular structures or crystal configurations through copolymerization modification, crosslinking modification, grafting modification, addition of nucleating agents and the like has appeared; and physical modification methods such as filling modification, blending modification, reinforcing modification and the like for obtaining the polypropylene composite material with excellent performance by adding organic or inorganic additives and the like into the polypropylene matrix in the mixing and mixing processes. But in the modification of polypropylene we also found:
first, the strength, especially the compressive strength and the toughness of polypropylene are inversely related, and the toughness gradually decreases with the increase of the strength of the polypropylene;
secondly, the flame retardant effect of the polypropylene is related to the addition amount of the flame retardant, the flame retardant cannot effectively resist flame if the addition amount of the flame retardant is too low, for example, the addition amount is less than 5%, but if the addition amount of the flame retardant is too high, for example, the addition amount is more than 10%, the strength of the polypropylene is obviously influenced, and meanwhile, the toughness is also reduced;
however, polypropylene power conduits have various application environments and flexible and variable use modes, for example, during use, articles or equipment with considerable weight may be arranged above the polypropylene power conduits, which requires good mechanical strength; for another example, in the installation process, the polypropylene power conduit needs to be bent in a medium and large radius, which requires good toughness; in addition, for power facilities, the polypropylene power conduit should have good flame retardant capability to prevent power accidents, so that the polypropylene power conduit should be improved in strength, toughness and flame retardant property to meet the use requirements and improve the use safety.
Disclosure of Invention
The invention designs a modified polypropylene power conduit and a preparation method thereof, which aim to solve the problems of low strength, poor toughness and poor flame retardant property of the conventional polypropylene power conduit.
In order to solve the problems, the invention discloses a modified polypropylene power conduit, which comprises a supporting layer, a supporting layer and a plurality of elastic pieces, wherein the supporting layer is a modified polypropylene pipe;
the functional layer is a multilayer tubular structure coated on the periphery of the supporting layer;
the functional layer comprises a plurality of functional layers which are arranged from inside to outside in sequence:
an outer layer which is a tubular foaming body formed by compounding modified polypropylene and first reinforced fibers;
the middle layer is a tubular foaming body formed by compounding modified polypropylene and second reinforced fibers;
the inner layer is formed by compounding a phase change material layer, a porous polypropylene film layer and a reinforcing net, and a flame retardant is arranged in the porous polypropylene film layer.
Further, the supporting layer comprises the following raw materials in parts by weight:
Figure BDA0003764204680000021
the outer layer comprises the following raw materials in parts by weight:
Figure BDA0003764204680000031
wherein the first reinforcing fibers are a mixture of elastomeric fibers and rigid fibers;
the intermediate layer comprises the following raw materials in parts by weight:
Figure BDA0003764204680000032
wherein the second reinforcing fibers are rigid fibers.
Further, in the functional layer, the thickness ratio among the outer layer, the intermediate layer and the inner layer is 1: (3-10): (0.2 to 0.5);
the porosity of the outer layer is 80-87%, and the porosity of the middle layer is 50-65%;
the average diameter of the air holes in the outer layer (6-10 um, and the average diameter of the air holes in the middle layer is 3-5 um).
Further, the porous polypropylene film layer comprises the following raw materials in parts by weight:
Figure BDA0003764204680000041
further, the preparation process of the porous polypropylene film layer is as follows:
s1, firstly, uniformly mixing polypropylene random copolymer and a beta nucleating agent, and extruding and granulating to prepare master batches;
s2, uniformly mixing the master batch, the pore size regulator and the auxiliary agent, and then melting and extruding at 180-230 ℃ to obtain a melt;
s3, sequentially passing the melt through a casting roller, an annealing roller, a rubber roller and a wind-up roller to obtain a membrane;
s4, stretching and heat setting the membrane to obtain a porous polypropylene base membrane;
s5, stirring and uniformly mixing the porous medium and the flame retardant material under the pressure of 0.3-1 MPa to obtain flame retardant particles;
s6, uniformly coating flame-retardant particles on the porous polypropylene base membrane;
and S7, pressing the porous medium loaded with the flame retardant particles into the porous polypropylene base film through a press roll to obtain a porous polypropylene film layer.
Further, the reinforcing net comprises a first grid structure and a second grid structure, wherein the first grid structure is a grid-shaped structure formed by intersecting fine fibers with the diameter smaller than 10 um; the second grid structure is a grid structure formed by crossing coarse fibers with the diameter larger than 100 um;
after the reinforcing mesh is arranged outside the supporting layer, the first grid structure is positioned at one side close to the middle layer, and the second grid structure is positioned at one side close to the supporting layer;
and marking a 45-degree angle bisector in the latticed reinforcing mesh as a straight line L, wherein the straight line L is parallel to the central axis of the supporting layer.
Furthermore, a plurality of adjacent flame-retardant micro-areas are formed in the inner layer, the flame-retardant micro-areas are rectangular areas surrounded by the coarse fibers, the phase-change energy storage materials are filled on the outer sides of the flame-retardant micro-areas, flame retardant agents are filled on the inner sides of the flame-retardant micro-areas, and the phase-change energy storage materials and the flame retardant agents are fixed through matrix materials and reinforcing nets which bear the flame retardant agents.
Further, the phase change material layer comprises the following raw materials in parts by weight:
Figure BDA0003764204680000051
further, the preparation method of the phase change material layer comprises the following steps:
z1, heating the phase change energy storage material to 70-90 ℃ through water bath heating, and stirring to completely melt the phase change energy storage material;
z2, adding kaolin into the melting system obtained in the step Z2, uniformly stirring, carrying out vacuum adsorption on the kaolin for 8-10 hours at the temperature of 70-90 ℃, and then naturally cooling to room temperature to obtain the composite phase change energy storage material;
z3, adding the composite phase change energy storage material into the chitosan solution, uniformly stirring, adding a cross-linking agent and organic micromolecules containing amino active functional groups, and continuously stirring for 0.5-1 h to obtain a phase change material mixed system for later use;
and Z4, coating the phase change material mixed system on one side of the first grid structure in the reinforcing mesh, and then carrying out freeze drying on the phase change material mixed system at the temperature of-25 to-5 ℃ to obtain the phase change material layer.
A method for preparing a modified polypropylene power conduit, which is used for preparing the modified polypropylene power conduit, and comprises the following steps:
p1, preparing a support layer:
(a1) Mixing materials: weighing the raw materials according to the thickness and the weight ratio of the supporting layer, and stirring the raw materials until the raw materials are uniformly mixed;
(a2) And (3) granulation: adding the uniformly mixed materials into an extruder, extruding and granulating to obtain granules of the supporting layer;
(a3) Extruding a supporting layer: adding the obtained granules into a double-screw or single-screw extruder, and carrying out extrusion molding to obtain a supporting layer;
p2, preparation of inner layer:
(b1) Coating heat-sensitive foaming adhesive: coating the thermosensitive foaming glue on the outer surface of the supporting layer in a mode of annular extrusion coating by an extruder;
(b2) Setting a porous polypropylene film layer: wrapping and pressing the prefabricated porous polypropylene film layer on the outer surface of the supporting layer, so that the porous polypropylene film layer is adhered to the outer surface of the supporting layer through the thermosensitive foaming adhesive;
(b3) Arranging a reinforcing net, fixing the reinforcing net on the porous polypropylene membrane layer through hot pressing, wherein the pressure during the hot pressing is set to be that the second grid structure in the reinforcing net can be partially inserted into the porous polypropylene membrane layer, and the first grid structure and part of the second grid structure are exposed outside the porous polypropylene membrane layer;
(b4) Setting a phase change material layer: coating the prefabricated phase-change material mixed system on one side of the reinforcing mesh where the first grid structure is located, and then carrying out freeze drying at-25 to-5 ℃ to obtain a phase-change material layer;
p3, preparation of the middle and outer layers:
(c1) Mixing materials: weighing the raw materials of the intermediate layer according to the thickness and the weight part ratio of the raw materials of the intermediate layer, and stirring and uniformly mixing the raw materials to obtain a mixture of the intermediate layer; weighing the raw materials of the outer layer according to the thickness and the weight part ratio of the outer layer, and stirring and uniformly mixing the raw materials to obtain a mixture of the outer layer;
(c2) And respectively adding the mixture of the middle layer and the mixture of the outer layer into a double-screw extruder, and extruding the pipes of the middle layer and the outer layer to the periphery of the supporting layer and the inner layer to obtain the power conduit.
The modified polypropylene power conduit and the preparation method thereof have the following advantages:
firstly, a compounding mode of random copolymerization polypropylene and homopolymerization polypropylene is adopted, the impact performance of the supporting layer is improved by increasing the content of the random copolymerization polypropylene in the base material, the supporting layer can be ensured to have good strength foundation and low-temperature toughness, and meanwhile, the strength and the toughness of the polypropylene pipe are further improved by adding a beta nucleating agent and butadiene rubber;
secondly, in the outer layer and the middle layer, the addition proportion of the random copolymerization polypropylene relative to the homopolymerization polypropylene is further increased, and the impact performance of the outer layer and the middle layer is improved, so that the outer layer and the middle layer are good in toughness and not easy to break;
thirdly, polypropylene is used as a base material for the inner layer, the middle layer and the outer layer in the modified polypropylene power conduit, so that the crystalline states of the layers are consistent, and the problem of space charge accumulation and further interlayer force reduction caused by phase interfaces among the layers can be solved;
fourth, in the modified polypropylene power conduit, compared with the middle layer, the outer layer has higher porosity and larger pore diameter, so that the outer layer is softer and easier to deform, and the thickness of the middle layer is much greater than that of the outer layer, so that when a relatively small deformation force is met, the outer layer is firstly influenced by external pressure to deform; when a large deformation force is met, the electric power conduit mainly resists the action of load by means of deformation of the intermediate layer; meanwhile, the strength of the outer layer and the middle layer is less than that of the supporting layer, and the toughness of the outer layer and the middle layer is better than that of the supporting layer, so that the electric power conduit mainly depends on the supporting layer to provide higher strength, particularly compressive strength; the power conduit is enabled to present different mechanical states under different stress conditions, the mechanical performance of the power conduit is the comprehensive reflection of the mechanical performances of the outer layer, the middle layer, the inner layer, the supporting layer and the like, the single performance of a single material is avoided, and the regulation and control can be carried out according to the stress state, so that the power conduit integrally presents good strength and toughness to the outside;
fifthly, the phase change energy storage material is loaded through kaolin, and then is wrapped through a three-dimensional network structure formed by chitosan crosslinking, so that large displacement and leakage are not easy to generate, and the influence on an intermediate layer and a porous polypropylene film layer adjacent to the intermediate layer is not easy to generate;
sixthly, the flame-retardant material is filled in the porous polypropylene film layer in a physical pressing mode, does not generate chemical crosslinking or reaction with other layers, and does not obviously influence the strength and toughness of the supporting layer, the middle layer and the outer layer;
seventh, the flame retardant material can be concentrated in the extremely thin porous polypropylene film layer by loading the porous polypropylene film layer, so that the layered enrichment of the flame retardant material is realized, and a high-strength flame retardant medium dense layer is formed between the support layer and the functional layer, so that the flame retardant material is prevented from being uniformly dispersed and distributed in the power conduit, and on one hand, the adverse effect of the flame retardant material on the overall property of the power conduit is avoided; on the other hand, the flame retardant effect of the flame retardant material is improved, and the using amount of the flame retardant material is reduced;
eighth, the strength and toughness of each layer can be improved by using the first reinforcing fibers, the second reinforcing fibers and the reinforcing mesh, particularly, the phase change material layer and the porous polypropylene film layer can be organically combined together by using the reinforcing mesh to form a plurality of adjacent flame-retardant micro-regions, and the phase change material layer and the porous polypropylene film layer are meshed and micro-zoned, so that the phase change material and the flame retardant therein are stably attached and are not easy to leak;
in a word, the modified polypropylene power conduit and the preparation method thereof have the advantages of high strength, good toughness and good flame retardant property.
Drawings
FIG. 1 is a schematic structural diagram of a cross section of a modified polypropylene power conduit according to the present invention;
FIG. 2 is a schematic structural view of a cross-section of a functional layer according to the present invention;
FIG. 3 is a schematic perspective view of a first lattice structure of the reinforcing mesh of the present invention;
fig. 4 is a schematic perspective view of a composite structure of a first mesh structure and a second mesh structure in the reinforcing mesh according to the present invention;
FIG. 5 is a schematic perspective view of the reinforcing mesh of the present invention;
FIG. 6 is a schematic front view of the reinforcing mesh of the present invention;
FIG. 7 isbase:Sub>A schematic cross-sectional view taken along the line A-A in FIG. 6;
FIG. 8 is a schematic structural view of a flame retardant domain according to the present invention.
Description of reference numerals:
1. a support layer; 2. a functional layer; 201. an outer layer; 202. an intermediate layer; 203. an inner layer; 2031. coarse fibers; 2032. fine fibers; 2033. a flame retardant domain; 2034. flame retardant particles; 2035. a phase change material layer; 2036. a porous polypropylene membrane layer.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1 to 8, a modified polypropylene power conduit comprises:
the supporting layer 1 is a tubular structure made of modified polypropylene;
the functional layer 2 is a multilayer tubular structure coated on the periphery of the support layer 1;
the functional layer 2 comprises a structure which is arranged from inside to outside in sequence:
an outer layer 201 which is a tubular foam body formed by compounding modified polypropylene and first reinforcing fibers;
an intermediate layer 202 which is a tubular foam formed by compounding modified polypropylene and second reinforcing fibers;
and the inner layer 203 is formed by compounding a phase change material layer 2035, a porous polypropylene film layer 2036 and a reinforcing net, wherein a flame retardant is arranged in the porous polypropylene film layer 2036.
Further, the support layer 1 comprises the following raw materials in parts by weight:
Figure BDA0003764204680000091
preferably, the melt flow rate of the random copolymerization polypropylene is 0.5-8g/10min; the melt flow rate of the homopolymerized polypropylene is 0.3-1g/10min. The molecular weight of the random copolymerization polypropylene and the homopolymerization polypropylene can be regulated and controlled through the melt flow rate of the random copolymerization polypropylene and the homopolymerization polypropylene, and further the strength and the toughness of the supporting layer 1 are regulated and controlled.
Preferably, the beta nucleating agent is one of aromatic amine beta nucleating agents, rare earth complex beta nucleating agents, fused ring compound nucleating agents and substituted aryl phosphate nucleating agents.
According to the application, the supporting layer 1 adopts a compounding mode of random copolymer polypropylene and homopolymerized polypropylene, the impact performance of the supporting layer 1 is improved by increasing the content of the random copolymer polypropylene in the base material, and the supporting layer 1 can be ensured to have good strength base and low-temperature toughness.
In addition, the crystal form of polypropylene plays a key role in the performance of polypropylene, usually, polypropylene mainly has alpha, beta, gamma, delta and quasi-hexagonal crystal forms, wherein the alpha-crystal polypropylene has higher elastic modulus and yield strength than the beta-crystal polypropylene, and the beta-crystal polypropylene is higher than the beta-crystal polypropylene in terms of tensile strength, elongation at break and impact toughness, but the alpha-crystal polypropylene is mainly generated in the crystallization process of the general molten polypropylene, so that the polypropylene pipe often has the defects of low pressure resistance and large low-temperature brittleness.
Moreover, the addition of butadiene rubber as an elastomer can further improve the strength and toughness of the polypropylene pipe.
Further, the auxiliary agent comprises the following raw materials in parts by weight:
Figure BDA0003764204680000101
preferably, the antioxidant is one or more of hindered phenol, phosphite and thio antioxidants.
Preferably, the surface modifier is one or more of vinyltrimethoxysilane, isobutyltriethoxysilane and 3-aminopropyltriethoxysilane.
Preferably, the dispersing agent is one or more of zinc stearate, polyethylene wax and vinyl bis-stearamide.
Preferably, the plasticizer is one or more of dioctyl phthalate, nonyl trimellitate and alkyl phenyl sulfate.
Preferably, the stabilizer is one or more of octyl tin maleate, lead dihydrochloride phthalate and lead dihydrochloride phosphite.
Preferably, the compatilizer is one or more of maleic anhydride grafted polypropylene, acrylic acid grafted polypropylene, acrylate grafted polypropylene and epoxy acrylate grafted polypropylene.
In the raw material design of the support layer 1: the stability, the oxidation resistance and the like of the polypropylene pipe can be effectively improved by adding the auxiliary agents such as the antioxidant, the surface modifier, the dispersing agent, the plasticizer, the stabilizer, the compatilizer and the like, and the comprehensive performance of the polypropylene pipe is further improved.
Further, the outer layer 201 comprises the following raw materials in parts by weight:
Figure BDA0003764204680000102
Figure BDA0003764204680000111
further, the intermediate layer 202 comprises the following raw materials in parts by weight:
Figure BDA0003764204680000112
the auxiliary agents in the outer layer 201 and the middle layer 202 are the same as those in the support layer 1, and the foaming agent is one or more of azodicarbonamide, azodiisobutyronitrile, N-dinitrosopentamethylenetetramine and p-benzenesulfonyl hydrazide.
In the outer layer 201 and the middle layer 202, the addition ratio of the random copolymerization polypropylene to the homopolymerization polypropylene is further increased, and the impact performance of the materials of the outer layer 201 and the middle layer 202 is improved, so that the materials have good toughness and are not easy to break.
The inner layer 203, the middle layer 202 and the outer layer 201 in the modified polypropylene power conduit adopt polypropylene as base materials, so that the crystalline states of all layers are consistent, and the problem of reduction of interlayer force caused by space charge aggregation due to phase interfaces among all layers can be solved.
Preferably, the elongation at break of the first reinforcing fibers is greater than the elongation at break of the second reinforcing fibers, so that the outer layer 201 has a greater elongation at break capability than the intermediate layer 202.
More preferably, the first reinforcing fibers are a mixture of elastic fibers and rigid fibers, the elastic fibers in the first reinforcing fibers account for 30 to 80 weight percent, and the toughness and strength of the outer layer 201 can be improved by the arrangement of the first reinforcing fibers.
As some examples of the present application, the elastic fiber is one or more of a nylon fiber, a polyester fiber, a spandex fiber, and an aramid fiber.
As some examples herein, the rigid fiber is one or more of a glass fiber, a carbon fiber, a metal wire, and the like.
As some examples of the present application, the first reinforcing fiber is a mixture of spandex fiber and glass fiber mixed in a ratio of 1.
Further, the second reinforcing fibers are rigid fibers.
Further, the first reinforcing fiber and the second reinforcing fiber are short fibers having a length of about 5 to 30 mm.
Further, the thickness ratio of the support layer 1 to the functional layer 2 is 1: (1.6-3.5).
Further, in the functional layer 2, the thickness ratio among the outer layer 201, the intermediate layer 202 and the inner layer 203 is 1: (3-10): (0.2-0.5).
Furthermore, the porosity of the outer layer 201 is 80-87%; the porosity of the intermediate layer 202 is 50 to 65%.
Preferably, the average diameter of the pores in the outer layer 201 is 6-10 um, and the average diameter of the pores in the middle layer 202 is 3-5 um.
By arranging the outer layer 201 and the intermediate layer 202 in the above structure, the outer layer 201 and the intermediate layer 202 have the following characteristics:
compared with the middle layer 202, the first and outer layers 201 have higher porosity and larger pore diameter, so that compared with the middle layer 202, the outer layer 201 is softer and easier to deform;
secondly, the outer layer 201 is wrapped on the middle layer 202, so that when a relatively small deformation force is encountered, the material of the outer layer 201 is firstly influenced by external pressure to deform;
third, the thickness of the middle layer 202 is much greater than that of the outer layer 201, so that the power conduit relies primarily on the deformation of the middle layer 202 to resist the action of the load when large deformation forces are encountered;
fourth, the strength of the outer layer 201 and the middle layer 202 is less than that of the support layer 1, and the toughness is better than that of the support layer 1, so that the power conduit mainly depends on the support layer 1 to provide higher strength, particularly compressive strength;
therefore, the power conduit presents different mechanical states under different stress conditions, the mechanical performance of the power conduit is the comprehensive reflection of the mechanical performances of the outer layer 201, the middle layer 202, the inner layer 203, the support layer 1 and the like, the power conduit is not single performance of a single material any more, and the regulation and control can be carried out according to the stress state, so that the power conduit integrally presents good strength and toughness to the outside.
Further, the porous polypropylene film layer 2036 comprises the following raw materials in parts by weight:
Figure BDA0003764204680000131
wherein, the auxiliary agent in the porous polypropylene membrane layer 2036 is the same as the auxiliary agent in the support layer 1.
Wherein, the pore diameter regulator is one or more of benzoate and alkyl carboxylate.
Preferably, the porous medium is one or more of nanoscale zeolite, montmorillonite, diatomite, attapulgite and sepiolite.
Preferably, the flame retardant may be a halogen-free flame retardant or a halogenated flame retardant.
Further, the average pore diameter of the porous polypropylene membrane layer 2036 is 1 to 50um.
Further, the porosity of the porous polypropylene film layer 2036 is 60 to 80%.
Furthermore, the formability of the beta crystal in the porous polypropylene film layer 2036 is 60 to 70%.
Further, the thickness of the porous polypropylene film layer 2036 is 10 to 100um, preferably 50 to 80um.
Specifically, the preparation process of the porous polypropylene film layer 2036 is as follows:
s1, firstly, uniformly mixing random copolymerization polypropylene and a beta nucleating agent, and preparing master batch through extrusion granulation;
s2, uniformly mixing the master batch, the pore size regulator and the auxiliary agent, and then melting and extruding at 180-230 ℃ to obtain a melt;
s3, sequentially passing the melt through a casting roller, an annealing roller, a rubber roller and a wind-up roller to obtain a membrane;
s4, stretching and heat setting the membrane to obtain a porous polypropylene base membrane;
s5, stirring and uniformly mixing the porous medium and the flame retardant material under the pressure of 0.3-1 MPa to obtain flame retardant particles 2034;
s6, uniformly coating flame-retardant particles 2034 on the porous polypropylene base film;
and S7, pressing the porous medium loaded with the flame retardant particles into the porous polypropylene base film through a pressing roller to obtain the porous polypropylene film layer 2036.
Preferably, in the step S3, the temperature of the casting roll is 120 to 150 ℃, and the temperature of the annealing roll is 60 to 90 ℃, preferably 60 to 75 ℃; the number of the annealing rollers is 3-5.
Further, in the step S3, the speed of the melt passing through the casting roller, the annealing roller, the rubber roller and the wind-up roller in sequence is 0.5-2 m/min.
Preferably, in the step S4, the stretching temperature is 120 to 160 ℃, the uniaxial stretching magnification is 1 to 3 times, and the simultaneous biaxial stretching magnification is 1 to 5 times.
Preferably, in the step S7, the pressure of the press roll is set as needed so as to press the porous medium loaded with the flame retardant particles into the pores in the porous polypropylene-based film.
In the preparation process of the porous polypropylene film layer 2036, the perfection of the beta crystal is improved through melting, tape casting, annealing, stretching and heat setting, the connection strength between the platelets is weakened, so that the beta crystal is easy to slide during stretching, micropores with larger pore diameter and better connectivity are formed, and an accommodating space is provided for the porous medium.
Further, the phase change material layer 2035 comprises the following raw materials in parts by weight:
Figure BDA0003764204680000151
the phase change energy storage material is preferably an organic phase change material, such as one or more of paraffin, beeswax, silicon wax, vaseline, palmitic acid, fatty acids and fatty alcohols.
Further, the organic micromolecules containing amino active functional groups are one or more of diethanolamine, triethanolamine and ethylenediamine.
Further, the cross-linking agent is one or more of tetrafluoroterephthalonitrile, diisocyanate, polyvinyl alcohol and diethylenetriamine.
Further, the phase change material layer 2035 is prepared by the following steps:
z1, heating the phase change energy storage material to 70-90 ℃ through water bath heating, and stirring to completely melt the phase change energy storage material;
z2, adding kaolin into the melting system obtained in the step Z2, uniformly stirring, carrying out vacuum adsorption on the kaolin for 8-10 hours at the temperature of 70-90 ℃, and then naturally cooling to room temperature to obtain the composite phase change energy storage material;
z3, adding the composite phase change energy storage material into the chitosan solution, uniformly stirring, adding a cross-linking agent and organic micromolecules containing amino active functional groups, and continuously stirring for 0.5-1 h to obtain a phase change material mixed system for later use;
and Z4, coating the phase change material mixed system on the outer side of the reinforcing mesh, namely the side where the first grid structure is positioned, and then freezing and drying the phase change material mixed system at the temperature of between 25 ℃ below zero and 5 ℃ below zero to obtain the phase change material layer 2035.
Wherein the chitosan solution is a dilute acid solution with the weight percentage of chitosan of 6-20%.
In the preparation process of the phase-change material layer 2035, the kaolin is firstly intercalated through the melting of the phase-change energy storage material to form the composite phase-change energy storage material, under the adsorption effect of the layered silicate structure of the kaolin, the phase-change energy storage material can slide to a certain degree in the processes of heat absorption and heat release to generate phase change, so that the volume change accompanying the phase-change process, especially the phase-change process, is easy to occur, and the phase-change energy storage material can be adsorbed and positioned to a certain degree, thereby avoiding the strength reduction of the inner layer 203 and the intermediate layer 202 caused by the reasons of remote flowing, leakage and the like.
And moreover, by adding the chitosan and the cross-linking agent, a three-dimensional reticular wrapping system is formed at the periphery of the composite phase-change energy storage material, so that the composite phase-change energy storage material is wrapped and positioned, and the leakage of the composite phase-change energy storage material is avoided.
In addition, the added organic small molecule containing an amino-active functional group can react with the chlorinated polypropylene in the intermediate layer 202 during the melt extrusion of the intermediate layer 202 to replace chlorine atoms in the chlorinated polypropylene, so that the phase change material layer 2035 can be stably combined with the intermediate layer 202.
Further, the reinforcing mesh comprises a first mesh structure and a second mesh structure, wherein the first mesh structure is a mesh structure formed by crossing and compounding fine fibers 2032 with the diameter less than 10 um; the second grid structure is a net structure formed by crossed and compounded coarse fibers 2031 with the diameter larger than 100 um.
Preferably, the first grid structure and the second grid structure are 18-mesh or more grid structures.
Further, the coarse fibers 2031 are rigid fibers and the fine fibers 2032 are elastic fibers.
As shown in fig. 3 to 7, in the reinforcing mesh, the coarse fibers 2031 and the fine fibers 2032 are alternately formed as radial fibers and the coarse fibers 2031 and the fine fibers 2032 are alternately formed as weft fibers and are crossly combined to form a grid-like fiber mesh, wherein the coarse fibers 2031 are one or more of glass fibers, carbon fibers, metal wires, and the like, and the fibers 2032 are one or more of nylon fibers, polyester fibers, spandex fibers, and aramid fibers.
Further, the preparation process of the reinforced net is as follows:
first, the fine fibers 2032 are woven into a first lattice structure;
then, the coarse fibers 2031 are woven into a second lattice structure;
then, the first grid-shaped structure and the second grid-shaped structure are overlapped, the thin fibers 2032 and the thick fibers 2031 are arranged at intervals in a staggered mode, and finally the reinforcing mesh is obtained through hot pressing and compounding.
In this application, the side where the first lattice structure is located is referred to as the outer side of the reinforcing mesh, and the side where the second lattice structure is located is referred to as the inner side of the reinforcing mesh, and accordingly, when the inner layer 203 is disposed on the supporting layer 1, the first lattice structure is located at the side close to the middle layer 202, and the second lattice structure is located at the side close to the supporting layer 1.
Further, a 45 ° bisector of an angle in the latticed fiber web in the reinforcing mesh is taken as a line L, and after the reinforcing mesh is disposed outside the supporting layer 1, the line L is disposed in parallel with the central axis of the supporting layer 1. In this way, the coarse fibers 2031 and the fine fibers 2032 are spirally interlaced and wound outside the support layer 1, the elastic fine fibers 2032 can provide a certain radial elasticity for the inner layer 203, and the rigid coarse fibers 2031 can be elastically positioned to prevent the coarse fibers 2031 from deviating from a set position too much; the coarse fibers 2031 are spirally wound outside the support layer 1, so that they can allow the inner layer 203 to axially stretch and bend, and provide a certain axial elasticity and toughness to the inner layer 203.
In addition, the reinforcing mesh, especially the first lattice structure therein, can further position the phase change energy storage material in the phase change material layer 2035.
Further, the porous polypropylene membrane layer 2036 is laminated on the reinforcing mesh, especially in the second lattice structure, by hot pressing.
Preferably, the phase change material layer 2035 is filled on one side of the reinforcing mesh close to the support layer 1, that is, on one side of the first grid structure; the porous polypropylene film layer 2036 is filled on a side of the reinforcing mesh away from the support layer 1, that is, on a side where the second lattice structure is located, the phase change material layer 2035 and the porous polypropylene film layer 2036 are compounded together by the reinforcing mesh, and a certain reinforcing and toughening effect is provided for the inner layer 203.
Further, the thickness of the phase change material layer 2035 is 0.2 to 0.5 times the diameter of the coarse fibers 2031, the thickness of the porous polypropylene film layer 2036 is 0.5 to 0.8 times the diameter of the coarse fibers 2031, and the total thickness of the coarse fibers 2031 and the porous polypropylene film layer 2036 is 1 time or less of the diameter of the phase change material layer 2035 and the diameter of the coarse fibers 2031 is 1.2 times or less of the diameter of the coarse fibers 2031. In this way, the phase change material layer 2035 and the porous polypropylene film layer 2036 can be stably combined together through the reinforcing mesh, and the phase change material layer 2035 and the porous polypropylene film layer 2036 are well positioned and shaped.
Meanwhile, due to the relative sizes of the diameters of the coarse fibers 2031 and the fine fibers 2032 and the thicknesses of the phase change material layer 2035 and the porous polypropylene film layer 2036, a plurality of adjacent flame retardant micro-regions 2033 may be formed in the inner layer 203, specifically, as shown in fig. 3 to 8, the flame retardant micro-regions 2033 are rectangular regions surrounded by the coarse fibers 2031, in the flame retardant micro-regions 2033, the outer side is filled with the phase change energy storage material, and the inner side is filled with the flame retardant particles 2034, and the phase change energy storage material and the flame retardant particles 2034 are fixed in position by the matrix material carrying the particles and the grid structure formed by the reinforcing mesh, respectively, which has the following advantages:
firstly, the phase change energy storage material is loaded by kaolin and then wrapped by a three-dimensional network structure formed by chitosan crosslinking, so that large displacement and leakage are not easy to generate, and the intermediate layer 202 and the porous polypropylene film layer 2036 adjacent to the phase change energy storage material are not easy to influence;
secondly, the flame retardant material is filled in the porous polypropylene film layer 2036 in a physical pressing manner, and does not chemically crosslink or react with other layers, so that the strength and toughness of the support layer 1, the middle layer 202 and the outer layer 201 are not obviously affected;
thirdly, the flame retardant material can be concentrated in the extremely thin porous polypropylene film layer 2036 by loading the porous polypropylene film layer 2036, so that the layered enrichment of the flame retardant material is realized, and a high-strength flame retardant medium dense layer is formed between the support layer 1 and the functional layer 2, so that the flame retardant material is prevented from being uniformly dispersed and distributed in the power conduit, and on one hand, the adverse effect of the flame retardant material on the overall property of the power conduit is avoided; on the other hand, the flame retardant effect of the flame retardant material is improved, and the using amount of the flame retardant material is reduced.
Further, the inner side of the inner layer 203 is adhered to the periphery of the support layer 1 by heat-sensitive foaming adhesive.
In addition, the present application also provides a preparation method of the modified polypropylene power conduit, the method is used for preparing the above modified polypropylene power conduit, and the method comprises the following steps:
p1, preparation of support layer 1:
(a1) Mixing materials: respectively weighing the random copolymer polypropylene, the homo-polypropylene, the butadiene rubber, the beta nucleating agent and the auxiliary agent according to the thickness and the weight ratio of the supporting layer 1, and stirring all the raw materials until the raw materials are uniformly mixed;
(a2) And (3) granulation: adding the uniformly mixed materials into an extruder, extruding and granulating to obtain granules of the support layer 1, wherein the temperature of a first zone of the extruder is 150-190 ℃, the temperature of a second zone of the extruder is 160-230 ℃, the temperature of a third zone of the extruder is 180-240 ℃, the temperature of a fourth zone of the extruder is 185-255 ℃, and the rotating speed of a screw of the extruder is 5-30 revolutions per minute;
(a3) Extrusion support layer 1: adding the obtained granules into a double-screw or single-screw extruder, and extruding and molding to obtain a supporting layer 1; wherein the temperature of the first zone of the extruder is 150-190 ℃, the temperature of the second zone is 160-230 ℃, the temperature of the third zone is 180-240 ℃, the temperature of the fourth zone is 185-255 ℃, the temperature of the first zone of the die is 180-245 ℃, the temperature of the second zone is 180-250 ℃, the temperature of the third zone is 190-255 ℃, the temperature of the mouth die is 190-265 ℃, the rotating speed of a screw of the extruder is 5-30 r/min, and the traction speed is 2-10 m/min;
p2, preparation of inner layer 203:
(b1) Coating heat-sensitive foaming adhesive: coating the heat-sensitive foaming adhesive on the outer surface of the support layer 1 in a ring-shaped extrusion coating mode through an extruder;
(b2) Setting the porous polypropylene film layer 2036: wrapping and pressing the prefabricated porous polypropylene film layer 2036 on the outer surface of the support layer 1, so that the porous polypropylene film layer 2036 is adhered to the outer surface of the support layer 1 through the thermosensitive foaming adhesive;
(b3) Arranging a reinforcing net, fixing the reinforcing net on the porous polypropylene film layer 2036 through hot pressing, wherein the pressure during the hot pressing is set to ensure that the second grid structure in the reinforcing net can be partially inserted into the porous polypropylene film layer 2036, and the first grid structure and part of the second grid structure are exposed out of the porous polypropylene film layer 2036;
(b4) Providing a phase change material layer 2035: coating the prefabricated phase-change material mixed system on the outer side of the reinforcing mesh, namely the side where the first grid structure is, and then carrying out freeze drying at-25 to-5 ℃ to obtain the phase-change material layer 2035;
p3, preparing the intermediate layer 202 and the outer layer 201:
(c1) Mixing materials: weighing the raw materials of the middle layer 202 according to the thickness and the weight part ratio of the raw materials of the middle layer 202, and stirring and uniformly mixing the raw materials to obtain a mixture of the middle layer 202; in addition, the raw materials of the outer layer 201 are weighed according to the thickness and the weight part ratio of the outer layer 201, and are stirred and uniformly mixed to obtain a mixture of the outer layer 201;
(c2) Respectively adding the mixture of the middle layer 202 and the mixture of the outer layer 201 into a double-screw extruder, and extruding the pipes of the middle layer 202 and the outer layer 201 to the peripheries of the support layer 1 and the inner layer 203 to obtain the electric power conduit, wherein the temperature of a first zone of a cylinder of the extruder is 165-180 ℃, the temperature of a second zone is 175-185 ℃, the temperature of a third zone is 190-210 ℃, the temperature of a fourth zone is 210-230 ℃, the temperature of a first zone of a die is 210-220 ℃, the temperature of the second zone is 200-190 ℃, the temperature of the third zone is 175-185 ℃, the temperature of a neck ring is 170-175 ℃, the screw rotating speed of the extruder is 5-30 revolutions/min, and the traction speed is 2-5 m/min.
The preparation method of the modified polypropylene power conduit is illustrated by the following specific test examples:
example 1
Preparing a porous polypropylene film layer:
taking 700g of random copolymer polypropylene, 10g of beta nucleating agent, 20g of benzoate, 200g of halogenated flame retardant, 200g of montmorillonite and 100g of auxiliary agent, firstly, uniformly mixing the random copolymer polypropylene and the beta nucleating agent, and extruding and granulating to prepare master batch; then uniformly mixing the master batch, benzoate and an auxiliary agent, and then melting and extruding at 180 ℃ to obtain a melt; sequentially passing the melt through a casting roller, an annealing roller, a rubber roller and a winding roller to obtain a membrane, wherein the temperature of the casting roller is 120 ℃, the temperature of the annealing roller is 70 ℃, the number of the annealing rollers is 3, and the sequential passing speed of the melt is 1m/min; then, synchronously and bidirectionally stretching the membrane by 3 times at 140 ℃, and obtaining a porous polypropylene base membrane after heat setting;
in addition, the porous medium and the flame retardant material are stirred and mixed uniformly under the pressure of 0.5MPa to obtain flame retardant particles; uniformly coating flame-retardant particles on the porous polypropylene base membrane; and then pressing the porous medium loaded with the flame retardant particles into the porous polypropylene base film through a compression roller to obtain a porous polypropylene film layer with the thickness of 100 um.
Example 2
Preparing a phase change material layer:
taking 500g of paraffin, 300g of kaolin, 50g of diethanolamine, 50g of chitosan and 2g of polyvinyl alcohol, heating the paraffin to 80 ℃ through water bath, and stirring to completely melt the paraffin; adding kaolin into molten paraffin, stirring uniformly, carrying out vacuum adsorption on the mixture at 70 ℃ for 8 hours, and then naturally cooling the mixture to room temperature to obtain the composite phase change energy storage material; adding the composite phase change energy storage material into 6% chitosan dilute acid solution, stirring uniformly, adding polyvinyl alcohol and diethanol amine, continuously stirring for 0.5h to obtain a phase change material mixed system, coating the phase change material mixed system on one side of the reinforcing mesh where the first grid structure is located, and then freeze-drying at-25 to-5 ℃ to obtain the phase change material layer.
Example 3
Preparing the power conduit:
firstly, respectively weighing random copolymerization polypropylene, homopolymerization polypropylene, butadiene rubber, beta nucleating agent and auxiliary agent according to the thickness and weight ratio of a supporting layer, and stirring all the raw materials until the raw materials are uniformly mixed; adding the uniformly mixed materials into an extruder, extruding and granulating to obtain granules of the supporting layer, wherein the temperature of a first zone of the extruder is 150 ℃, the temperature of a second zone of the extruder is 160 ℃, the temperature of a third zone of the extruder is 180 ℃, the temperature of a fourth zone of the extruder is 185 ℃, and the rotating speed of a screw of the extruder is 5 revolutions per minute; adding the obtained granules into a double-screw extruder, and extruding and molding to obtain a supporting layer; wherein the temperature of a first zone of a cylinder of the screw extruder is 150 ℃, the temperature of a second zone is 160 ℃, the temperature of a third zone is 180 ℃, the temperature of a fourth zone is 185 ℃, the temperature of a first zone of a die is 180 ℃, the temperature of a second zone is 180 ℃, the temperature of a third zone is 190 ℃, the temperature of a neck ring die is 190 ℃, the rotating speed of a screw of the extruder is 5 revolutions per minute, and the traction speed is 2m per minute, so as to obtain a supporting layer pipe;
then coating the heat-sensitive foaming adhesive on the outer surface of the supporting layer in a mode of annular extrusion coating of an extruder; wrapping and pressing the porous polypropylene film layer prepared in the embodiment 1 on the outer surface of the supporting layer, and adhering the porous polypropylene film layer on the outer surface of the supporting layer through the heat-sensitive foaming adhesive; fixing a reinforcing net on the porous polypropylene film layer through hot pressing, wherein fine fibers in the reinforcing net are spandex fibers with the diameter of 8um, coarse fibers are steel wires with the diameter of 120um, the mesh number of a first grid structure and a second grid structure in the reinforcing net is 18 meshes, and the pressure setting during hot pressing is that part of the second grid structure in the reinforcing net is inserted into the porous polypropylene film layer, and the first grid structure and the rest of the second grid structure are preferably exposed outside the porous polypropylene film layer; coating the prefabricated phase change material mixed system on one side of the reinforcing mesh where the first grid structure is located, and then freeze-drying the reinforced mesh at-15 ℃ to obtain a phase change material layer, wherein the thickness of the phase change material layer is 30 microns;
then weighing the raw materials of the middle layer according to the thickness and the weight part ratio of the raw materials of the middle layer, and stirring and uniformly mixing the raw materials to obtain a mixture of the middle layer; in addition, weighing the raw materials of the outer layer according to the thickness and the weight part ratio of the outer layer, and stirring and uniformly mixing the raw materials to obtain a mixture of the outer layer; and respectively adding the mixture of the middle layer and the mixture of the outer layer into a double-screw extruder, and extruding the pipes of the middle layer and the outer layer to the periphery of the supporting layer and the inner layer to obtain the electric power conduit, wherein the temperature of a first zone of a cylinder of the extruder is 165 ℃, the temperature of a second zone of the cylinder of the extruder is 175 ℃, the temperature of a third zone of the cylinder of the extruder is 190 ℃, the temperature of a fourth zone of the cylinder of the extruder is 210 ℃, the temperature of a first zone of a die is 210 ℃, the temperature of the second zone of the cylinder of the extruder is 200 ℃, the temperature of the third zone of the cylinder of the extruder is 175 ℃, the temperature of a neck ring die is 170 ℃, the rotating speed of a screw of the extruder is 10 revolutions per minute, and the traction speed is 3m per minute.
In this embodiment, the raw materials of the supporting layer, the middle layer, and the outer layer are weighed according to the lowest weight ratio.
Finally, the following results are obtained through measurement: the power conduit obtained in example 3 had an outer diameter of 25mm and a wall thickness of 1.96mm.
The dimensions of the power conduit obtained in this example were measured under a microscope, and the wall thickness of the support layer was about 506um, the wall thickness of the inner layer was about 124um, the wall thickness of the middle layer was about 1042um, and the wall thickness of the outer layer was about 291um.
Example 4
The difference between this example and the above example 3 is that the raw materials of the supporting layer, the middle layer and the outer layer are weighed according to the highest weight ratio, and the rest parameters are the same as those in the above example 1.
The power conduit obtained in example 4 had an outer diameter of 25mm and a wall thickness of 2.05mm, and the dimensions of the power conduit obtained in this example were measured under a microscope to obtain a wall thickness of the support layer of about 508um, the inner layer of about 121um, the intermediate layer of about 1056um, and the outer layer of about 362um.
Test example 1
The performance test was performed on the power conduit obtained in example 3 above, in which:
the ring stiffness is measured according to GB/T9647-2003 'measurement of ring stiffness of thermoplastic plastic pipes';
the tensile strength and the elongation at break are measured according to GB/T8804.2-2016 (determination of tensile property of thermoplastic plastic pipes);
the bending strength is measured according to GB/T9341-2008 'determination of Plastic bending Property';
the cantilever beam impact strength is measured according to GB/T1843-2008 'measurement of Plastic cantilever beam impact Strength';
the heat conductivity coefficient is measured according to GB/T10297-2015 'measuring hot wire method for heat conductivity coefficient of non-metallic solid material';
the flame retardant rating is determined according to UL94 flame retardant rating test standards and methods, and the detection results are shown in Table 1:
TABLE 1 results of mechanical Properties measurements
Figure BDA0003764204680000231
Although the present invention is disclosed above, the present invention is not limited thereto. In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A modified polypropylene power conduit, comprising:
a support layer (1) which is a modified polypropylene tube;
the functional layer (2) is of a multilayer tubular structure coated on the periphery of the support layer (1);
the functional layer (2) comprises a structure which is arranged from inside to outside in sequence:
an outer layer (201) which is a tubular foam body formed by compounding modified polypropylene and first reinforcing fibers;
an intermediate layer (202) which is a tubular foam body formed by compounding modified polypropylene and second reinforcing fibers;
the inner layer (203) is formed by compounding a phase change material layer (2035), a porous polypropylene membrane layer (2036) and a reinforcing net, and a flame retardant is arranged in the porous polypropylene membrane layer (2036).
2. The modified polypropylene power conduit according to claim 1, wherein the support layer (1) comprises the following raw materials in parts by weight:
Figure FDA0003764204670000011
the outer layer (201) comprises the following raw materials in parts by weight:
Figure FDA0003764204670000012
wherein the first reinforcing fibers are a mixture of elastic fibers and rigid fibers;
the intermediate layer (202) comprises the following raw materials in parts by weight:
Figure FDA0003764204670000021
wherein the second reinforcing fibers are rigid fibers.
3. The modified polypropylene power conduit of claim 1 or 2,
in the functional layer (2), the thickness ratio between the outer layer (201), the intermediate layer (202) and the inner layer (203) is 1: (3-10): (0.2 to 0.5);
the porosity of the outer layer (201) is 80-87%, and the porosity of the middle layer (202) is 50-65%;
the average diameter of the air holes in the outer layer (201) is 6-10 um, and the average diameter of the air holes in the middle layer (202) is 3-5 um.
4. The modified polypropylene power conduit of claim 1, wherein the porous polypropylene membrane layer (2036) comprises the following raw materials in parts by weight:
Figure FDA0003764204670000022
Figure FDA0003764204670000031
5. the modified polypropylene power conduit of claim 4, wherein the porous polypropylene membrane layer (2036) is prepared by the following process:
s1, firstly, uniformly mixing random copolymerization polypropylene and a beta nucleating agent, and preparing master batch through extrusion granulation;
s2, uniformly mixing the master batch, the pore size regulator and the auxiliary agent, and then melting and extruding at 180-230 ℃ to obtain a melt;
s3, sequentially passing the melt through a casting roller, an annealing roller, a rubber roller and a wind-up roller to obtain a membrane;
s4, stretching and heat setting the membrane to obtain a porous polypropylene base membrane;
s5, stirring and uniformly mixing the porous medium and the flame retardant material under the pressure of 0.3-1 MPa to obtain flame retardant particles;
s6, uniformly coating flame-retardant particles on the porous polypropylene base membrane;
and S7, pressing the porous medium loaded with the flame retardant particles into the porous polypropylene base film through a press roll to obtain a porous polypropylene film layer.
6. The modified polypropylene power conduit of claim 1,
the reinforcing net comprises a first grid structure and a second grid structure, wherein the first grid structure is a grid-shaped structure formed by crossing fine fibers (2032) with the diameter smaller than 10 um; the second grid structure is a grid structure formed by crossing coarse fibers (2031) with the diameter larger than 100 um;
after the reinforcing mesh is arranged outside the supporting layer (1), the first grid structure is positioned at one side close to the middle layer (202), and the second grid structure is positioned at one side close to the supporting layer (1);
and marking a 45-degree angle bisector in the latticed reinforcing mesh as a straight line L, wherein the straight line L is arranged in parallel with the central axis of the supporting layer (1).
7. The modified polypropylene power conduit of claim 6,
a plurality of adjacent flame-retardant micro-areas (2033) are formed in the inner layer (203), each flame-retardant micro-area (2033) is a rectangular area surrounded by the corresponding coarse fiber (2031), the outer sides of the corresponding flame-retardant micro-areas (2033) are filled with phase-change energy storage materials, the inner sides of the corresponding flame-retardant micro-areas are filled with flame retardants, and the phase-change energy storage materials and the flame retardants are fixed through matrix materials bearing the phase-change energy storage materials and the reinforcing nets respectively.
8. The modified polypropylene power conduit of claim 6, wherein the phase change material layer (2035) comprises the following raw materials in parts by weight:
Figure FDA0003764204670000041
9. the modified polypropylene power conduit of claim 8, wherein the phase change material layer (2035) is prepared by:
z1, heating the phase change energy storage material to 70-90 ℃ through water bath heating, and stirring to completely melt the phase change energy storage material;
z2, adding kaolin into the melting system obtained in the step Z2, uniformly stirring, carrying out vacuum adsorption on the kaolin for 8-10 hours at the temperature of 70-90 ℃, and then naturally cooling to room temperature to obtain the composite phase change energy storage material;
z3, adding the composite phase change energy storage material into the chitosan solution, uniformly stirring, adding a cross-linking agent and organic micromolecules containing amino active functional groups, and continuously stirring for 0.5-1 h to obtain a phase change material mixed system for later use;
and Z4, coating the phase change material mixed system on one side of the first grid structure in the reinforcing net, and then freezing and drying the phase change material mixed system at the temperature of between 25 ℃ below zero and 5 ℃ below zero to obtain the phase change material layer.
10. A method for preparing a modified polypropylene power conduit, wherein the method is used for preparing the modified polypropylene power conduit of any one of the claims 1 to 9, and the method comprises the following steps:
p1, preparing a supporting layer:
(a1) Mixing materials: weighing the raw materials according to the thickness and the weight ratio of the supporting layer, and stirring the raw materials until the raw materials are uniformly mixed;
(a2) And (3) granulation: adding the uniformly mixed materials into an extruder, extruding and granulating to obtain granules of the supporting layer;
(a3) Extruding a supporting layer: adding the obtained granules into a double-screw or single-screw extruder, and carrying out extrusion molding to obtain a supporting layer;
p2, preparation of inner layer:
(b1) Coating heat-sensitive foaming adhesive: coating the thermosensitive foaming glue on the outer surface of the supporting layer in a mode of annular extrusion coating by an extruder;
(b2) Setting a porous polypropylene film layer: wrapping and pressing the prefabricated porous polypropylene film layer on the outer surface of the supporting layer, so that the porous polypropylene film layer is adhered to the outer surface of the supporting layer through the thermosensitive foaming adhesive;
(b3) Arranging a reinforcing net, fixing the reinforcing net on the porous polypropylene membrane layer through hot pressing, wherein the pressure during the hot pressing is set to be that the second grid structure in the reinforcing net can be partially inserted into the porous polypropylene membrane layer, and the first grid structure and part of the second grid structure are exposed outside the porous polypropylene membrane layer;
(b4) Setting a phase change material layer: coating the prefabricated phase-change material mixed system on one side of the first grid structure in the reinforcing net, and then carrying out freeze drying at-25 to-5 ℃ to obtain a phase-change material layer;
p3, preparation of intermediate and outer layers:
(c1) Mixing materials: weighing the raw materials of the intermediate layer according to the thickness and the weight part ratio of the raw materials of the intermediate layer, and stirring and uniformly mixing the raw materials to obtain a mixture of the intermediate layer; weighing the raw materials of the outer layer according to the thickness and the weight part ratio of the outer layer, and stirring and uniformly mixing the raw materials to obtain a mixture of the outer layer;
(c2) And respectively adding the mixture of the middle layer and the mixture of the outer layer into a double-screw extruder, and extruding the pipes of the middle layer and the outer layer to the periphery of the supporting layer and the inner layer to obtain the power conduit.
CN202210881151.7A 2022-07-26 2022-07-26 Modified polypropylene power conduit and preparation method thereof Active CN115139614B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210881151.7A CN115139614B (en) 2022-07-26 2022-07-26 Modified polypropylene power conduit and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210881151.7A CN115139614B (en) 2022-07-26 2022-07-26 Modified polypropylene power conduit and preparation method thereof

Publications (2)

Publication Number Publication Date
CN115139614A true CN115139614A (en) 2022-10-04
CN115139614B CN115139614B (en) 2024-02-06

Family

ID=83414053

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210881151.7A Active CN115139614B (en) 2022-07-26 2022-07-26 Modified polypropylene power conduit and preparation method thereof

Country Status (1)

Country Link
CN (1) CN115139614B (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020189697A1 (en) * 2001-06-06 2002-12-19 Jyri Jarvenkyla Multilayer pipe and method for manufacturing one
JP2011074214A (en) * 2009-09-30 2011-04-14 Asahi Kasei E-Materials Corp Microporous film, laminated microporous film, battery separator and method for producing microporous film
CN103047486A (en) * 2011-10-17 2013-04-17 上海伟星新型建材有限公司 Double-orientation fiber-reinforced polypropylene randon copolymer three-layer composite tube
US20140363645A1 (en) * 2011-12-08 2014-12-11 Jáger Invest Kereskedelmi, Szolgáltató És Ingatlanhasznosító Kft. Multilayered product for joint utilization of smc, bmc and pet waste
CN104861302A (en) * 2015-06-09 2015-08-26 北京斯维浩特新材料科技有限公司 Highly flame-retardant polypropylene foaming sheet and preparation method thereof
CN109291525A (en) * 2018-09-25 2019-02-01 上海伟星新型建材有限公司 The polypropylene random copolymer composite tube and preparation method of fiber reinforcement beta crystal
CN109994689A (en) * 2017-12-29 2019-07-09 华为技术有限公司 Fire proofing, diaphragm and preparation method, secondary cell, electronic equipment
CN110126230A (en) * 2019-04-08 2019-08-16 江苏远通塑胶制品有限公司 Three layers of composite copolymerization polypropylene composite pipe and preparation method thereof
CN211868788U (en) * 2019-11-05 2020-11-06 浙江金波管业有限公司 MPP electric power communication pipe that possesses fire prevention fire-retardant function

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020189697A1 (en) * 2001-06-06 2002-12-19 Jyri Jarvenkyla Multilayer pipe and method for manufacturing one
JP2011074214A (en) * 2009-09-30 2011-04-14 Asahi Kasei E-Materials Corp Microporous film, laminated microporous film, battery separator and method for producing microporous film
CN103047486A (en) * 2011-10-17 2013-04-17 上海伟星新型建材有限公司 Double-orientation fiber-reinforced polypropylene randon copolymer three-layer composite tube
US20140363645A1 (en) * 2011-12-08 2014-12-11 Jáger Invest Kereskedelmi, Szolgáltató És Ingatlanhasznosító Kft. Multilayered product for joint utilization of smc, bmc and pet waste
CN104861302A (en) * 2015-06-09 2015-08-26 北京斯维浩特新材料科技有限公司 Highly flame-retardant polypropylene foaming sheet and preparation method thereof
CN109994689A (en) * 2017-12-29 2019-07-09 华为技术有限公司 Fire proofing, diaphragm and preparation method, secondary cell, electronic equipment
CN109291525A (en) * 2018-09-25 2019-02-01 上海伟星新型建材有限公司 The polypropylene random copolymer composite tube and preparation method of fiber reinforcement beta crystal
CN110126230A (en) * 2019-04-08 2019-08-16 江苏远通塑胶制品有限公司 Three layers of composite copolymerization polypropylene composite pipe and preparation method thereof
CN211868788U (en) * 2019-11-05 2020-11-06 浙江金波管业有限公司 MPP electric power communication pipe that possesses fire prevention fire-retardant function

Also Published As

Publication number Publication date
CN115139614B (en) 2024-02-06

Similar Documents

Publication Publication Date Title
RU2403486C2 (en) Cooling agent pipeline
AU2003233323B2 (en) Polypropylene compositions especially for pipes
US4692480A (en) Thermoplastic resin composition
EP0520473B1 (en) Multi-layered foam heat-shrinkable tube
KR102541099B1 (en) Plastic liner for a composite pressure vessel
EP1004618A1 (en) Articles having antistatic properties
KR100707566B1 (en) Blow molding method and blow molded product
CN111486277B (en) High-pressure-resistant anti-static gas filling hose for compressed natural gas and preparation method thereof
US20070227758A1 (en) Jacket for heat-insulated conduits and method for making same
CN109836702B (en) Polypropylene-based in-situ microfiber foaming material with beta nucleating agent selectively distributed and preparation method thereof
JP4214669B2 (en) Resin structure and its use
CN102134462B (en) Hot melt adhesive for polyster fibre reinforced PVC flexible pipe and preparation method thereof
CN115139614A (en) Modified polypropylene power conduit and preparation method thereof
JP5157705B2 (en) Resin structure
CN109416146B (en) Non-sagging flexible insulation
KR101142395B1 (en) Process for the Production of Impact Resistant Pipe
CN109161076A (en) A kind of preparation process of high impact properties anti-corrosion lightweight PE solid wall pipe
CN108724877B (en) Multilayer polymer film and method for producing same
KR20190071605A (en) Composition of rubber for a concreate docking hose and the concreate docking hose including the same
JPS62234304A (en) Flexible magnetic substance core composition
CN218094731U (en) Hollow wall glass fiber pipe
KR101310395B1 (en) Corrugatd pipe and manufacturing method thereof
CN112962783A (en) Bearing structure
CN116622157A (en) Glass fiber reinforced composite material and preparation method and application thereof
JP2018185017A (en) Flexible hose for gas

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant